Packaging container and packaging method of acrylamide crystal

Abstract

A packaging container for acrylamide crystals comprising (a) an inner bag consisting of a packaging material having moisture permeability in order to package acrylamide crystals, (b) an interlayer bag consisting of a packaging material having impermeability to atmospheric water-vapor and a gas-barrier property, and, if necessary, (c) an outer bag consisting of an exterior material, and a method for packaging acrylamide crystal by using the above container, is disclosed. According to the present invention, contamination of foreign particles such as lint and dust or tackiness due to moisture can be prevented in transportation and storage.

What is claimed is: 
     
       1. A packaging method for acrylamide crystals having a water moisture content of 0.1-2.0% by weight which can cause condensation in a package, comprising the steps of: (a) enclosing and sealing said acrylamide crystals in an inner bag consisting of a packaging material having moisture permeability of at least 300 g/m 2 .24 hour at 40° C. in 90% RH,   (b) enclosing and sealing said inner bag and drying agent in an interlayer bag consisting of a packaging material having a water-vapor permeability of 10 g/m 2 .24 hours or less at 40° C. in 90% RH and a gas barrier property, and   (c) enclosing and sealing said interlayer bag in an outer bag consisting of an exterior material; so that the moisture vapor from the acrylamide crystals permeate through the inner bag into the interlayer bag where it is absorbed by the drying agent, thereby preventing condensation of the moisture vapor on the inside surface of the inner bag.   
     
     
       2. The packaging method of claim 1 wherein the inner bag consists of a packaging material selected from the group consisting of a nonwoven fabric comprised of pulp or synthetic resin fiber, and a synthetic resin sheet having many pores. 
     
     
       3. The packaging method of claim 1 wherein the interlayer bag consists of a packaging material selected from the group consisting of a synthetic resin sheet, a synthetic resin laminated paper and an aluminum laminated sheet. 
     
     
       4. The packaging method of claim 1 wherein the outer bag consists of an exterior material selected from the group consisting of a synthetic resin sheet, a plastic bottle, a metallic can, a pail can, a corrugated box and a multi-ply kraft paper. 
     
     
       5. The packaging method of claim 1 wherein the drying agent is selected from the group consisting of silica gel, calcium chloride, disodium hydrogenphosphate, magnesium sulfate, calcium oxide and phosphoric anhydride.